Engine room ventillation

[vpkumar]

Can any one guide me on engine room ventillation calculations guidelines.

V.P.Kumar

[marshmat]

Look up the requirements given by the classification society whose standards the boat is being built to. Better yet, compare the Lloyds, ABS and DNV requirements that apply to the type of boat you're building, and exceed the strictest of them by a fair margin.

[StianM]

I don't remember it, but recal it was engine consumption + 5-10%

cylinder volum x rpm x chargepreshure(bar) will give you about the nead for air per minute. If you can not you will lose some off the power the engine could produce.

I remeber a ambulance boat built in the comunety I grew up had fitted engine ventilation that was not big enough and they where not able to get the speed they where suposed to befour they cutt away half the toilet to fitt biger intakes.

I'm shure engine suplier can give you the information you nead.

[vpkumar]

Thank you very much.

V.P.Kumar

Originally Posted by marshmat

Look up the requirements given by the classification society whose standards the boat is being built to. Better yet, compare the Lloyds, ABS and DNV requirements that apply to the type of boat you're building, and exceed the strictest of them by a fair margin.

[lazeyjack]

your engine maker will give you the allowable temperature rise for the E/R
On newbuilds, the rep comes to do the seatrial, he measures the temp at start and then after the boat and e/r and engine have been working for an hour and the rise above ambient must not exceed a figure, so say if the temp is 20c and it rises to 50c, thats way over, I can not remember the exact fugure

[vpkumar]

Thanks a lot for your advice.[

QUOTE=StianM;144236]I don't remember it, but recal it was engine consumption + 5-10%

cylinder volum x rpm x chargepreshure(bar) will give you about the nead for air per minute. If you can not you will lose some off the power the engine could produce.

I remeber a ambulance boat built in the comunety I grew up had fitted engine ventilation that was not big enough and they where not able to get the speed they where suposed to befour they cutt away half the toilet to fitt biger intakes.

I'm shure engine suplier can give you the information you nead.[/quote]